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Linux 4.8.3
[linux/fpc-iii.git] / net / ipv6 / ip6mr.c
blob7f4265b1649b60eff007b61c0a59bdb244de03d3
1 /*
2 * Linux IPv6 multicast routing support for BSD pim6sd
3 * Based on net/ipv4/ipmr.c.
4 *
5 * (c) 2004 Mickael Hoerdt, <hoerdt@clarinet.u-strasbg.fr>
6 * LSIIT Laboratory, Strasbourg, France
7 * (c) 2004 Jean-Philippe Andriot, <jean-philippe.andriot@6WIND.com>
8 * 6WIND, Paris, France
9 * Copyright (C)2007,2008 USAGI/WIDE Project
10 * YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
11 *
12 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU General Public License
14 * as published by the Free Software Foundation; either version
15 * 2 of the License, or (at your option) any later version.
16 *
17 */
18
19 #include <asm/uaccess.h>
20 #include <linux/types.h>
21 #include <linux/sched.h>
22 #include <linux/errno.h>
23 #include <linux/timer.h>
24 #include <linux/mm.h>
25 #include <linux/kernel.h>
26 #include <linux/fcntl.h>
27 #include <linux/stat.h>
28 #include <linux/socket.h>
29 #include <linux/inet.h>
30 #include <linux/netdevice.h>
31 #include <linux/inetdevice.h>
32 #include <linux/proc_fs.h>
33 #include <linux/seq_file.h>
34 #include <linux/init.h>
35 #include <linux/slab.h>
36 #include <linux/compat.h>
37 #include <net/protocol.h>
38 #include <linux/skbuff.h>
39 #include <net/sock.h>
40 #include <net/raw.h>
41 #include <linux/notifier.h>
42 #include <linux/if_arp.h>
43 #include <net/checksum.h>
44 #include <net/netlink.h>
45 #include <net/fib_rules.h>
46
47 #include <net/ipv6.h>
48 #include <net/ip6_route.h>
49 #include <linux/mroute6.h>
50 #include <linux/pim.h>
51 #include <net/addrconf.h>
52 #include <linux/netfilter_ipv6.h>
53 #include <linux/export.h>
54 #include <net/ip6_checksum.h>
55 #include <linux/netconf.h>
56
57 struct mr6_table {
58 struct list_head list;
59 possible_net_t net;
60 u32 id;
61 struct sock *mroute6_sk;
62 struct timer_list ipmr_expire_timer;
63 struct list_head mfc6_unres_queue;
64 struct list_head mfc6_cache_array[MFC6_LINES];
65 struct mif_device vif6_table[MAXMIFS];
66 int maxvif;
67 atomic_t cache_resolve_queue_len;
68 bool mroute_do_assert;
69 bool mroute_do_pim;
70 #ifdef CONFIG_IPV6_PIMSM_V2
71 int mroute_reg_vif_num;
72 #endif
73 };
74
75 struct ip6mr_rule {
76 struct fib_rule common;
77 };
78
79 struct ip6mr_result {
80 struct mr6_table *mrt;
81 };
82
83 /* Big lock, protecting vif table, mrt cache and mroute socket state.
84 Note that the changes are semaphored via rtnl_lock.
85 */
86
87 static DEFINE_RWLOCK(mrt_lock);
88
89 /*
90 * Multicast router control variables
91 */
92
93 #define MIF_EXISTS(_mrt, _idx) ((_mrt)->vif6_table[_idx].dev != NULL)
94
95 /* Special spinlock for queue of unresolved entries */
96 static DEFINE_SPINLOCK(mfc_unres_lock);
97
98 /* We return to original Alan's scheme. Hash table of resolved
99 entries is changed only in process context and protected
100 with weak lock mrt_lock. Queue of unresolved entries is protected
101 with strong spinlock mfc_unres_lock.
102
103 In this case data path is free of exclusive locks at all.
104 */
105
106 static struct kmem_cache *mrt_cachep __read_mostly;
107
108 static struct mr6_table *ip6mr_new_table(struct net *net, u32 id);
109 static void ip6mr_free_table(struct mr6_table *mrt);
110
111 static void ip6_mr_forward(struct net *net, struct mr6_table *mrt,
112 struct sk_buff *skb, struct mfc6_cache *cache);
113 static int ip6mr_cache_report(struct mr6_table *mrt, struct sk_buff *pkt,
114 mifi_t mifi, int assert);
115 static int __ip6mr_fill_mroute(struct mr6_table *mrt, struct sk_buff *skb,
116 struct mfc6_cache *c, struct rtmsg *rtm);
117 static void mr6_netlink_event(struct mr6_table *mrt, struct mfc6_cache *mfc,
118 int cmd);
119 static int ip6mr_rtm_dumproute(struct sk_buff *skb,
120 struct netlink_callback *cb);
121 static void mroute_clean_tables(struct mr6_table *mrt, bool all);
122 static void ipmr_expire_process(unsigned long arg);
123
124 #ifdef CONFIG_IPV6_MROUTE_MULTIPLE_TABLES
125 #define ip6mr_for_each_table(mrt, net) \
126 list_for_each_entry_rcu(mrt, &net->ipv6.mr6_tables, list)
127
128 static struct mr6_table *ip6mr_get_table(struct net *net, u32 id)
129 {
130 struct mr6_table *mrt;
131
132 ip6mr_for_each_table(mrt, net) {
133 if (mrt->id == id)
134 return mrt;
135 }
136 return NULL;
137 }
138
139 static int ip6mr_fib_lookup(struct net *net, struct flowi6 *flp6,
140 struct mr6_table **mrt)
141 {
142 int err;
143 struct ip6mr_result res;
144 struct fib_lookup_arg arg = {
145 .result = &res,
146 .flags = FIB_LOOKUP_NOREF,
147 };
148
149 err = fib_rules_lookup(net->ipv6.mr6_rules_ops,
150 flowi6_to_flowi(flp6), 0, &arg);
151 if (err < 0)
152 return err;
153 *mrt = res.mrt;
154 return 0;
155 }
156
157 static int ip6mr_rule_action(struct fib_rule *rule, struct flowi *flp,
158 int flags, struct fib_lookup_arg *arg)
159 {
160 struct ip6mr_result *res = arg->result;
161 struct mr6_table *mrt;
162
163 switch (rule->action) {
164 case FR_ACT_TO_TBL:
165 break;
166 case FR_ACT_UNREACHABLE:
167 return -ENETUNREACH;
168 case FR_ACT_PROHIBIT:
169 return -EACCES;
170 case FR_ACT_BLACKHOLE:
171 default:
172 return -EINVAL;
173 }
174
175 mrt = ip6mr_get_table(rule->fr_net, rule->table);
176 if (!mrt)
177 return -EAGAIN;
178 res->mrt = mrt;
179 return 0;
180 }
181
182 static int ip6mr_rule_match(struct fib_rule *rule, struct flowi *flp, int flags)
183 {
184 return 1;
185 }
186
187 static const struct nla_policy ip6mr_rule_policy[FRA_MAX + 1] = {
188 FRA_GENERIC_POLICY,
189 };
190
191 static int ip6mr_rule_configure(struct fib_rule *rule, struct sk_buff *skb,
192 struct fib_rule_hdr *frh, struct nlattr **tb)
193 {
194 return 0;
195 }
196
197 static int ip6mr_rule_compare(struct fib_rule *rule, struct fib_rule_hdr *frh,
198 struct nlattr **tb)
199 {
200 return 1;
201 }
202
203 static int ip6mr_rule_fill(struct fib_rule *rule, struct sk_buff *skb,
204 struct fib_rule_hdr *frh)
205 {
206 frh->dst_len = 0;
207 frh->src_len = 0;
208 frh->tos = 0;
209 return 0;
210 }
211
212 static const struct fib_rules_ops __net_initconst ip6mr_rules_ops_template = {
213 .family = RTNL_FAMILY_IP6MR,
214 .rule_size = sizeof(struct ip6mr_rule),
215 .addr_size = sizeof(struct in6_addr),
216 .action = ip6mr_rule_action,
217 .match = ip6mr_rule_match,
218 .configure = ip6mr_rule_configure,
219 .compare = ip6mr_rule_compare,
220 .fill = ip6mr_rule_fill,
221 .nlgroup = RTNLGRP_IPV6_RULE,
222 .policy = ip6mr_rule_policy,
223 .owner = THIS_MODULE,
224 };
225
226 static int __net_init ip6mr_rules_init(struct net *net)
227 {
228 struct fib_rules_ops *ops;
229 struct mr6_table *mrt;
230 int err;
231
232 ops = fib_rules_register(&ip6mr_rules_ops_template, net);
233 if (IS_ERR(ops))
234 return PTR_ERR(ops);
235
236 INIT_LIST_HEAD(&net->ipv6.mr6_tables);
237
238 mrt = ip6mr_new_table(net, RT6_TABLE_DFLT);
239 if (!mrt) {
240 err = -ENOMEM;
241 goto err1;
242 }
243
244 err = fib_default_rule_add(ops, 0x7fff, RT6_TABLE_DFLT, 0);
245 if (err < 0)
246 goto err2;
247
248 net->ipv6.mr6_rules_ops = ops;
249 return 0;
250
251 err2:
252 ip6mr_free_table(mrt);
253 err1:
254 fib_rules_unregister(ops);
255 return err;
256 }
257
258 static void __net_exit ip6mr_rules_exit(struct net *net)
259 {
260 struct mr6_table *mrt, *next;
261
262 rtnl_lock();
263 list_for_each_entry_safe(mrt, next, &net->ipv6.mr6_tables, list) {
264 list_del(&mrt->list);
265 ip6mr_free_table(mrt);
266 }
267 fib_rules_unregister(net->ipv6.mr6_rules_ops);
268 rtnl_unlock();
269 }
270 #else
271 #define ip6mr_for_each_table(mrt, net) \
272 for (mrt = net->ipv6.mrt6; mrt; mrt = NULL)
273
274 static struct mr6_table *ip6mr_get_table(struct net *net, u32 id)
275 {
276 return net->ipv6.mrt6;
277 }
278
279 static int ip6mr_fib_lookup(struct net *net, struct flowi6 *flp6,
280 struct mr6_table **mrt)
281 {
282 *mrt = net->ipv6.mrt6;
283 return 0;
284 }
285
286 static int __net_init ip6mr_rules_init(struct net *net)
287 {
288 net->ipv6.mrt6 = ip6mr_new_table(net, RT6_TABLE_DFLT);
289 return net->ipv6.mrt6 ? 0 : -ENOMEM;
290 }
291
292 static void __net_exit ip6mr_rules_exit(struct net *net)
293 {
294 rtnl_lock();
295 ip6mr_free_table(net->ipv6.mrt6);
296 net->ipv6.mrt6 = NULL;
297 rtnl_unlock();
298 }
299 #endif
300
301 static struct mr6_table *ip6mr_new_table(struct net *net, u32 id)
302 {
303 struct mr6_table *mrt;
304 unsigned int i;
305
306 mrt = ip6mr_get_table(net, id);
307 if (mrt)
308 return mrt;
309
310 mrt = kzalloc(sizeof(*mrt), GFP_KERNEL);
311 if (!mrt)
312 return NULL;
313 mrt->id = id;
314 write_pnet(&mrt->net, net);
315
316 /* Forwarding cache */
317 for (i = 0; i < MFC6_LINES; i++)
318 INIT_LIST_HEAD(&mrt->mfc6_cache_array[i]);
319
320 INIT_LIST_HEAD(&mrt->mfc6_unres_queue);
321
322 setup_timer(&mrt->ipmr_expire_timer, ipmr_expire_process,
323 (unsigned long)mrt);
324
325 #ifdef CONFIG_IPV6_PIMSM_V2
326 mrt->mroute_reg_vif_num = -1;
327 #endif
328 #ifdef CONFIG_IPV6_MROUTE_MULTIPLE_TABLES
329 list_add_tail_rcu(&mrt->list, &net->ipv6.mr6_tables);
330 #endif
331 return mrt;
332 }
333
334 static void ip6mr_free_table(struct mr6_table *mrt)
335 {
336 del_timer_sync(&mrt->ipmr_expire_timer);
337 mroute_clean_tables(mrt, true);
338 kfree(mrt);
339 }
340
341 #ifdef CONFIG_PROC_FS
342
343 struct ipmr_mfc_iter {
344 struct seq_net_private p;
345 struct mr6_table *mrt;
346 struct list_head *cache;
347 int ct;
348 };
349
350
351 static struct mfc6_cache *ipmr_mfc_seq_idx(struct net *net,
352 struct ipmr_mfc_iter *it, loff_t pos)
353 {
354 struct mr6_table *mrt = it->mrt;
355 struct mfc6_cache *mfc;
356
357 read_lock(&mrt_lock);
358 for (it->ct = 0; it->ct < MFC6_LINES; it->ct++) {
359 it->cache = &mrt->mfc6_cache_array[it->ct];
360 list_for_each_entry(mfc, it->cache, list)
361 if (pos-- == 0)
362 return mfc;
363 }
364 read_unlock(&mrt_lock);
365
366 spin_lock_bh(&mfc_unres_lock);
367 it->cache = &mrt->mfc6_unres_queue;
368 list_for_each_entry(mfc, it->cache, list)
369 if (pos-- == 0)
370 return mfc;
371 spin_unlock_bh(&mfc_unres_lock);
372
373 it->cache = NULL;
374 return NULL;
375 }
376
377 /*
378 * The /proc interfaces to multicast routing /proc/ip6_mr_cache /proc/ip6_mr_vif
379 */
380
381 struct ipmr_vif_iter {
382 struct seq_net_private p;
383 struct mr6_table *mrt;
384 int ct;
385 };
386
387 static struct mif_device *ip6mr_vif_seq_idx(struct net *net,
388 struct ipmr_vif_iter *iter,
389 loff_t pos)
390 {
391 struct mr6_table *mrt = iter->mrt;
392
393 for (iter->ct = 0; iter->ct < mrt->maxvif; ++iter->ct) {
394 if (!MIF_EXISTS(mrt, iter->ct))
395 continue;
396 if (pos-- == 0)
397 return &mrt->vif6_table[iter->ct];
398 }
399 return NULL;
400 }
401
402 static void *ip6mr_vif_seq_start(struct seq_file *seq, loff_t *pos)
403 __acquires(mrt_lock)
404 {
405 struct ipmr_vif_iter *iter = seq->private;
406 struct net *net = seq_file_net(seq);
407 struct mr6_table *mrt;
408
409 mrt = ip6mr_get_table(net, RT6_TABLE_DFLT);
410 if (!mrt)
411 return ERR_PTR(-ENOENT);
412
413 iter->mrt = mrt;
414
415 read_lock(&mrt_lock);
416 return *pos ? ip6mr_vif_seq_idx(net, seq->private, *pos - 1)
417 : SEQ_START_TOKEN;
418 }
419
420 static void *ip6mr_vif_seq_next(struct seq_file *seq, void *v, loff_t *pos)
421 {
422 struct ipmr_vif_iter *iter = seq->private;
423 struct net *net = seq_file_net(seq);
424 struct mr6_table *mrt = iter->mrt;
425
426 ++*pos;
427 if (v == SEQ_START_TOKEN)
428 return ip6mr_vif_seq_idx(net, iter, 0);
429
430 while (++iter->ct < mrt->maxvif) {
431 if (!MIF_EXISTS(mrt, iter->ct))
432 continue;
433 return &mrt->vif6_table[iter->ct];
434 }
435 return NULL;
436 }
437
438 static void ip6mr_vif_seq_stop(struct seq_file *seq, void *v)
439 __releases(mrt_lock)
440 {
441 read_unlock(&mrt_lock);
442 }
443
444 static int ip6mr_vif_seq_show(struct seq_file *seq, void *v)
445 {
446 struct ipmr_vif_iter *iter = seq->private;
447 struct mr6_table *mrt = iter->mrt;
448
449 if (v == SEQ_START_TOKEN) {
450 seq_puts(seq,
451 "Interface BytesIn PktsIn BytesOut PktsOut Flags\n");
452 } else {
453 const struct mif_device *vif = v;
454 const char *name = vif->dev ? vif->dev->name : "none";
455
456 seq_printf(seq,
457 "%2td %-10s %8ld %7ld %8ld %7ld %05X\n",
458 vif - mrt->vif6_table,
459 name, vif->bytes_in, vif->pkt_in,
460 vif->bytes_out, vif->pkt_out,
461 vif->flags);
462 }
463 return 0;
464 }
465
466 static const struct seq_operations ip6mr_vif_seq_ops = {
467 .start = ip6mr_vif_seq_start,
468 .next = ip6mr_vif_seq_next,
469 .stop = ip6mr_vif_seq_stop,
470 .show = ip6mr_vif_seq_show,
471 };
472
473 static int ip6mr_vif_open(struct inode *inode, struct file *file)
474 {
475 return seq_open_net(inode, file, &ip6mr_vif_seq_ops,
476 sizeof(struct ipmr_vif_iter));
477 }
478
479 static const struct file_operations ip6mr_vif_fops = {
480 .owner = THIS_MODULE,
481 .open = ip6mr_vif_open,
482 .read = seq_read,
483 .llseek = seq_lseek,
484 .release = seq_release_net,
485 };
486
487 static void *ipmr_mfc_seq_start(struct seq_file *seq, loff_t *pos)
488 {
489 struct ipmr_mfc_iter *it = seq->private;
490 struct net *net = seq_file_net(seq);
491 struct mr6_table *mrt;
492
493 mrt = ip6mr_get_table(net, RT6_TABLE_DFLT);
494 if (!mrt)
495 return ERR_PTR(-ENOENT);
496
497 it->mrt = mrt;
498 return *pos ? ipmr_mfc_seq_idx(net, seq->private, *pos - 1)
499 : SEQ_START_TOKEN;
500 }
501
502 static void *ipmr_mfc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
503 {
504 struct mfc6_cache *mfc = v;
505 struct ipmr_mfc_iter *it = seq->private;
506 struct net *net = seq_file_net(seq);
507 struct mr6_table *mrt = it->mrt;
508
509 ++*pos;
510
511 if (v == SEQ_START_TOKEN)
512 return ipmr_mfc_seq_idx(net, seq->private, 0);
513
514 if (mfc->list.next != it->cache)
515 return list_entry(mfc->list.next, struct mfc6_cache, list);
516
517 if (it->cache == &mrt->mfc6_unres_queue)
518 goto end_of_list;
519
520 BUG_ON(it->cache != &mrt->mfc6_cache_array[it->ct]);
521
522 while (++it->ct < MFC6_LINES) {
523 it->cache = &mrt->mfc6_cache_array[it->ct];
524 if (list_empty(it->cache))
525 continue;
526 return list_first_entry(it->cache, struct mfc6_cache, list);
527 }
528
529 /* exhausted cache_array, show unresolved */
530 read_unlock(&mrt_lock);
531 it->cache = &mrt->mfc6_unres_queue;
532 it->ct = 0;
533
534 spin_lock_bh(&mfc_unres_lock);
535 if (!list_empty(it->cache))
536 return list_first_entry(it->cache, struct mfc6_cache, list);
537
538 end_of_list:
539 spin_unlock_bh(&mfc_unres_lock);
540 it->cache = NULL;
541
542 return NULL;
543 }
544
545 static void ipmr_mfc_seq_stop(struct seq_file *seq, void *v)
546 {
547 struct ipmr_mfc_iter *it = seq->private;
548 struct mr6_table *mrt = it->mrt;
549
550 if (it->cache == &mrt->mfc6_unres_queue)
551 spin_unlock_bh(&mfc_unres_lock);
552 else if (it->cache == &mrt->mfc6_cache_array[it->ct])
553 read_unlock(&mrt_lock);
554 }
555
556 static int ipmr_mfc_seq_show(struct seq_file *seq, void *v)
557 {
558 int n;
559
560 if (v == SEQ_START_TOKEN) {
561 seq_puts(seq,
562 "Group "
563 "Origin "
564 "Iif Pkts Bytes Wrong Oifs\n");
565 } else {
566 const struct mfc6_cache *mfc = v;
567 const struct ipmr_mfc_iter *it = seq->private;
568 struct mr6_table *mrt = it->mrt;
569
570 seq_printf(seq, "%pI6 %pI6 %-3hd",
571 &mfc->mf6c_mcastgrp, &mfc->mf6c_origin,
572 mfc->mf6c_parent);
573
574 if (it->cache != &mrt->mfc6_unres_queue) {
575 seq_printf(seq, " %8lu %8lu %8lu",
576 mfc->mfc_un.res.pkt,
577 mfc->mfc_un.res.bytes,
578 mfc->mfc_un.res.wrong_if);
579 for (n = mfc->mfc_un.res.minvif;
580 n < mfc->mfc_un.res.maxvif; n++) {
581 if (MIF_EXISTS(mrt, n) &&
582 mfc->mfc_un.res.ttls[n] < 255)
583 seq_printf(seq,
584 " %2d:%-3d",
585 n, mfc->mfc_un.res.ttls[n]);
586 }
587 } else {
588 /* unresolved mfc_caches don't contain
589 * pkt, bytes and wrong_if values
590 */
591 seq_printf(seq, " %8lu %8lu %8lu", 0ul, 0ul, 0ul);
592 }
593 seq_putc(seq, '\n');
594 }
595 return 0;
596 }
597
598 static const struct seq_operations ipmr_mfc_seq_ops = {
599 .start = ipmr_mfc_seq_start,
600 .next = ipmr_mfc_seq_next,
601 .stop = ipmr_mfc_seq_stop,
602 .show = ipmr_mfc_seq_show,
603 };
604
605 static int ipmr_mfc_open(struct inode *inode, struct file *file)
606 {
607 return seq_open_net(inode, file, &ipmr_mfc_seq_ops,
608 sizeof(struct ipmr_mfc_iter));
609 }
610
611 static const struct file_operations ip6mr_mfc_fops = {
612 .owner = THIS_MODULE,
613 .open = ipmr_mfc_open,
614 .read = seq_read,
615 .llseek = seq_lseek,
616 .release = seq_release_net,
617 };
618 #endif
619
620 #ifdef CONFIG_IPV6_PIMSM_V2
621
622 static int pim6_rcv(struct sk_buff *skb)
623 {
624 struct pimreghdr *pim;
625 struct ipv6hdr *encap;
626 struct net_device *reg_dev = NULL;
627 struct net *net = dev_net(skb->dev);
628 struct mr6_table *mrt;
629 struct flowi6 fl6 = {
630 .flowi6_iif = skb->dev->ifindex,
631 .flowi6_mark = skb->mark,
632 };
633 int reg_vif_num;
634
635 if (!pskb_may_pull(skb, sizeof(*pim) + sizeof(*encap)))
636 goto drop;
637
638 pim = (struct pimreghdr *)skb_transport_header(skb);
639 if (pim->type != ((PIM_VERSION << 4) | PIM_REGISTER) ||
640 (pim->flags & PIM_NULL_REGISTER) ||
641 (csum_ipv6_magic(&ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
642 sizeof(*pim), IPPROTO_PIM,
643 csum_partial((void *)pim, sizeof(*pim), 0)) &&
644 csum_fold(skb_checksum(skb, 0, skb->len, 0))))
645 goto drop;
646
647 /* check if the inner packet is destined to mcast group */
648 encap = (struct ipv6hdr *)(skb_transport_header(skb) +
649 sizeof(*pim));
650
651 if (!ipv6_addr_is_multicast(&encap->daddr) ||
652 encap->payload_len == 0 ||
653 ntohs(encap->payload_len) + sizeof(*pim) > skb->len)
654 goto drop;
655
656 if (ip6mr_fib_lookup(net, &fl6, &mrt) < 0)
657 goto drop;
658 reg_vif_num = mrt->mroute_reg_vif_num;
659
660 read_lock(&mrt_lock);
661 if (reg_vif_num >= 0)
662 reg_dev = mrt->vif6_table[reg_vif_num].dev;
663 if (reg_dev)
664 dev_hold(reg_dev);
665 read_unlock(&mrt_lock);
666
667 if (!reg_dev)
668 goto drop;
669
670 skb->mac_header = skb->network_header;
671 skb_pull(skb, (u8 *)encap - skb->data);
672 skb_reset_network_header(skb);
673 skb->protocol = htons(ETH_P_IPV6);
674 skb->ip_summed = CHECKSUM_NONE;
675
676 skb_tunnel_rx(skb, reg_dev, dev_net(reg_dev));
677
678 netif_rx(skb);
679
680 dev_put(reg_dev);
681 return 0;
682 drop:
683 kfree_skb(skb);
684 return 0;
685 }
686
687 static const struct inet6_protocol pim6_protocol = {
688 .handler = pim6_rcv,
689 };
690
691 /* Service routines creating virtual interfaces: PIMREG */
692
693 static netdev_tx_t reg_vif_xmit(struct sk_buff *skb,
694 struct net_device *dev)
695 {
696 struct net *net = dev_net(dev);
697 struct mr6_table *mrt;
698 struct flowi6 fl6 = {
699 .flowi6_oif = dev->ifindex,
700 .flowi6_iif = skb->skb_iif ? : LOOPBACK_IFINDEX,
701 .flowi6_mark = skb->mark,
702 };
703 int err;
704
705 err = ip6mr_fib_lookup(net, &fl6, &mrt);
706 if (err < 0) {
707 kfree_skb(skb);
708 return err;
709 }
710
711 read_lock(&mrt_lock);
712 dev->stats.tx_bytes += skb->len;
713 dev->stats.tx_packets++;
714 ip6mr_cache_report(mrt, skb, mrt->mroute_reg_vif_num, MRT6MSG_WHOLEPKT);
715 read_unlock(&mrt_lock);
716 kfree_skb(skb);
717 return NETDEV_TX_OK;
718 }
719
720 static int reg_vif_get_iflink(const struct net_device *dev)
721 {
722 return 0;
723 }
724
725 static const struct net_device_ops reg_vif_netdev_ops = {
726 .ndo_start_xmit = reg_vif_xmit,
727 .ndo_get_iflink = reg_vif_get_iflink,
728 };
729
730 static void reg_vif_setup(struct net_device *dev)
731 {
732 dev->type = ARPHRD_PIMREG;
733 dev->mtu = 1500 - sizeof(struct ipv6hdr) - 8;
734 dev->flags = IFF_NOARP;
735 dev->netdev_ops = &reg_vif_netdev_ops;
736 dev->destructor = free_netdev;
737 dev->features |= NETIF_F_NETNS_LOCAL;
738 }
739
740 static struct net_device *ip6mr_reg_vif(struct net *net, struct mr6_table *mrt)
741 {
742 struct net_device *dev;
743 char name[IFNAMSIZ];
744
745 if (mrt->id == RT6_TABLE_DFLT)
746 sprintf(name, "pim6reg");
747 else
748 sprintf(name, "pim6reg%u", mrt->id);
749
750 dev = alloc_netdev(0, name, NET_NAME_UNKNOWN, reg_vif_setup);
751 if (!dev)
752 return NULL;
753
754 dev_net_set(dev, net);
755
756 if (register_netdevice(dev)) {
757 free_netdev(dev);
758 return NULL;
759 }
760
761 if (dev_open(dev))
762 goto failure;
763
764 dev_hold(dev);
765 return dev;
766
767 failure:
768 unregister_netdevice(dev);
769 return NULL;
770 }
771 #endif
772
773 /*
774 * Delete a VIF entry
775 */
776
777 static int mif6_delete(struct mr6_table *mrt, int vifi, struct list_head *head)
778 {
779 struct mif_device *v;
780 struct net_device *dev;
781 struct inet6_dev *in6_dev;
782
783 if (vifi < 0 || vifi >= mrt->maxvif)
784 return -EADDRNOTAVAIL;
785
786 v = &mrt->vif6_table[vifi];
787
788 write_lock_bh(&mrt_lock);
789 dev = v->dev;
790 v->dev = NULL;
791
792 if (!dev) {
793 write_unlock_bh(&mrt_lock);
794 return -EADDRNOTAVAIL;
795 }
796
797 #ifdef CONFIG_IPV6_PIMSM_V2
798 if (vifi == mrt->mroute_reg_vif_num)
799 mrt->mroute_reg_vif_num = -1;
800 #endif
801
802 if (vifi + 1 == mrt->maxvif) {
803 int tmp;
804 for (tmp = vifi - 1; tmp >= 0; tmp--) {
805 if (MIF_EXISTS(mrt, tmp))
806 break;
807 }
808 mrt->maxvif = tmp + 1;
809 }
810
811 write_unlock_bh(&mrt_lock);
812
813 dev_set_allmulti(dev, -1);
814
815 in6_dev = __in6_dev_get(dev);
816 if (in6_dev) {
817 in6_dev->cnf.mc_forwarding--;
818 inet6_netconf_notify_devconf(dev_net(dev),
819 NETCONFA_MC_FORWARDING,
820 dev->ifindex, &in6_dev->cnf);
821 }
822
823 if (v->flags & MIFF_REGISTER)
824 unregister_netdevice_queue(dev, head);
825
826 dev_put(dev);
827 return 0;
828 }
829
830 static inline void ip6mr_cache_free(struct mfc6_cache *c)
831 {
832 kmem_cache_free(mrt_cachep, c);
833 }
834
835 /* Destroy an unresolved cache entry, killing queued skbs
836 and reporting error to netlink readers.
837 */
838
839 static void ip6mr_destroy_unres(struct mr6_table *mrt, struct mfc6_cache *c)
840 {
841 struct net *net = read_pnet(&mrt->net);
842 struct sk_buff *skb;
843
844 atomic_dec(&mrt->cache_resolve_queue_len);
845
846 while ((skb = skb_dequeue(&c->mfc_un.unres.unresolved)) != NULL) {
847 if (ipv6_hdr(skb)->version == 0) {
848 struct nlmsghdr *nlh = (struct nlmsghdr *)skb_pull(skb, sizeof(struct ipv6hdr));
849 nlh->nlmsg_type = NLMSG_ERROR;
850 nlh->nlmsg_len = nlmsg_msg_size(sizeof(struct nlmsgerr));
851 skb_trim(skb, nlh->nlmsg_len);
852 ((struct nlmsgerr *)nlmsg_data(nlh))->error = -ETIMEDOUT;
853 rtnl_unicast(skb, net, NETLINK_CB(skb).portid);
854 } else
855 kfree_skb(skb);
856 }
857
858 ip6mr_cache_free(c);
859 }
860
861
862 /* Timer process for all the unresolved queue. */
863
864 static void ipmr_do_expire_process(struct mr6_table *mrt)
865 {
866 unsigned long now = jiffies;
867 unsigned long expires = 10 * HZ;
868 struct mfc6_cache *c, *next;
869
870 list_for_each_entry_safe(c, next, &mrt->mfc6_unres_queue, list) {
871 if (time_after(c->mfc_un.unres.expires, now)) {
872 /* not yet... */
873 unsigned long interval = c->mfc_un.unres.expires - now;
874 if (interval < expires)
875 expires = interval;
876 continue;
877 }
878
879 list_del(&c->list);
880 mr6_netlink_event(mrt, c, RTM_DELROUTE);
881 ip6mr_destroy_unres(mrt, c);
882 }
883
884 if (!list_empty(&mrt->mfc6_unres_queue))
885 mod_timer(&mrt->ipmr_expire_timer, jiffies + expires);
886 }
887
888 static void ipmr_expire_process(unsigned long arg)
889 {
890 struct mr6_table *mrt = (struct mr6_table *)arg;
891
892 if (!spin_trylock(&mfc_unres_lock)) {
893 mod_timer(&mrt->ipmr_expire_timer, jiffies + 1);
894 return;
895 }
896
897 if (!list_empty(&mrt->mfc6_unres_queue))
898 ipmr_do_expire_process(mrt);
899
900 spin_unlock(&mfc_unres_lock);
901 }
902
903 /* Fill oifs list. It is called under write locked mrt_lock. */
904
905 static void ip6mr_update_thresholds(struct mr6_table *mrt, struct mfc6_cache *cache,
906 unsigned char *ttls)
907 {
908 int vifi;
909
910 cache->mfc_un.res.minvif = MAXMIFS;
911 cache->mfc_un.res.maxvif = 0;
912 memset(cache->mfc_un.res.ttls, 255, MAXMIFS);
913
914 for (vifi = 0; vifi < mrt->maxvif; vifi++) {
915 if (MIF_EXISTS(mrt, vifi) &&
916 ttls[vifi] && ttls[vifi] < 255) {
917 cache->mfc_un.res.ttls[vifi] = ttls[vifi];
918 if (cache->mfc_un.res.minvif > vifi)
919 cache->mfc_un.res.minvif = vifi;
920 if (cache->mfc_un.res.maxvif <= vifi)
921 cache->mfc_un.res.maxvif = vifi + 1;
922 }
923 }
924 cache->mfc_un.res.lastuse = jiffies;
925 }
926
927 static int mif6_add(struct net *net, struct mr6_table *mrt,
928 struct mif6ctl *vifc, int mrtsock)
929 {
930 int vifi = vifc->mif6c_mifi;
931 struct mif_device *v = &mrt->vif6_table[vifi];
932 struct net_device *dev;
933 struct inet6_dev *in6_dev;
934 int err;
935
936 /* Is vif busy ? */
937 if (MIF_EXISTS(mrt, vifi))
938 return -EADDRINUSE;
939
940 switch (vifc->mif6c_flags) {
941 #ifdef CONFIG_IPV6_PIMSM_V2
942 case MIFF_REGISTER:
943 /*
944 * Special Purpose VIF in PIM
945 * All the packets will be sent to the daemon
946 */
947 if (mrt->mroute_reg_vif_num >= 0)
948 return -EADDRINUSE;
949 dev = ip6mr_reg_vif(net, mrt);
950 if (!dev)
951 return -ENOBUFS;
952 err = dev_set_allmulti(dev, 1);
953 if (err) {
954 unregister_netdevice(dev);
955 dev_put(dev);
956 return err;
957 }
958 break;
959 #endif
960 case 0:
961 dev = dev_get_by_index(net, vifc->mif6c_pifi);
962 if (!dev)
963 return -EADDRNOTAVAIL;
964 err = dev_set_allmulti(dev, 1);
965 if (err) {
966 dev_put(dev);
967 return err;
968 }
969 break;
970 default:
971 return -EINVAL;
972 }
973
974 in6_dev = __in6_dev_get(dev);
975 if (in6_dev) {
976 in6_dev->cnf.mc_forwarding++;
977 inet6_netconf_notify_devconf(dev_net(dev),
978 NETCONFA_MC_FORWARDING,
979 dev->ifindex, &in6_dev->cnf);
980 }
981
982 /*
983 * Fill in the VIF structures
984 */
985 v->rate_limit = vifc->vifc_rate_limit;
986 v->flags = vifc->mif6c_flags;
987 if (!mrtsock)
988 v->flags |= VIFF_STATIC;
989 v->threshold = vifc->vifc_threshold;
990 v->bytes_in = 0;
991 v->bytes_out = 0;
992 v->pkt_in = 0;
993 v->pkt_out = 0;
994 v->link = dev->ifindex;
995 if (v->flags & MIFF_REGISTER)
996 v->link = dev_get_iflink(dev);
997
998 /* And finish update writing critical data */
999 write_lock_bh(&mrt_lock);
1000 v->dev = dev;
1001 #ifdef CONFIG_IPV6_PIMSM_V2
1002 if (v->flags & MIFF_REGISTER)
1003 mrt->mroute_reg_vif_num = vifi;
1004 #endif
1005 if (vifi + 1 > mrt->maxvif)
1006 mrt->maxvif = vifi + 1;
1007 write_unlock_bh(&mrt_lock);
1008 return 0;
1009 }
1010
1011 static struct mfc6_cache *ip6mr_cache_find(struct mr6_table *mrt,
1012 const struct in6_addr *origin,
1013 const struct in6_addr *mcastgrp)
1014 {
1015 int line = MFC6_HASH(mcastgrp, origin);
1016 struct mfc6_cache *c;
1017
1018 list_for_each_entry(c, &mrt->mfc6_cache_array[line], list) {
1019 if (ipv6_addr_equal(&c->mf6c_origin, origin) &&
1020 ipv6_addr_equal(&c->mf6c_mcastgrp, mcastgrp))
1021 return c;
1022 }
1023 return NULL;
1024 }
1025
1026 /* Look for a (*,*,oif) entry */
1027 static struct mfc6_cache *ip6mr_cache_find_any_parent(struct mr6_table *mrt,
1028 mifi_t mifi)
1029 {
1030 int line = MFC6_HASH(&in6addr_any, &in6addr_any);
1031 struct mfc6_cache *c;
1032
1033 list_for_each_entry(c, &mrt->mfc6_cache_array[line], list)
1034 if (ipv6_addr_any(&c->mf6c_origin) &&
1035 ipv6_addr_any(&c->mf6c_mcastgrp) &&
1036 (c->mfc_un.res.ttls[mifi] < 255))
1037 return c;
1038
1039 return NULL;
1040 }
1041
1042 /* Look for a (*,G) entry */
1043 static struct mfc6_cache *ip6mr_cache_find_any(struct mr6_table *mrt,
1044 struct in6_addr *mcastgrp,
1045 mifi_t mifi)
1046 {
1047 int line = MFC6_HASH(mcastgrp, &in6addr_any);
1048 struct mfc6_cache *c, *proxy;
1049
1050 if (ipv6_addr_any(mcastgrp))
1051 goto skip;
1052
1053 list_for_each_entry(c, &mrt->mfc6_cache_array[line], list)
1054 if (ipv6_addr_any(&c->mf6c_origin) &&
1055 ipv6_addr_equal(&c->mf6c_mcastgrp, mcastgrp)) {
1056 if (c->mfc_un.res.ttls[mifi] < 255)
1057 return c;
1058
1059 /* It's ok if the mifi is part of the static tree */
1060 proxy = ip6mr_cache_find_any_parent(mrt,
1061 c->mf6c_parent);
1062 if (proxy && proxy->mfc_un.res.ttls[mifi] < 255)
1063 return c;
1064 }
1065
1066 skip:
1067 return ip6mr_cache_find_any_parent(mrt, mifi);
1068 }
1069
1070 /*
1071 * Allocate a multicast cache entry
1072 */
1073 static struct mfc6_cache *ip6mr_cache_alloc(void)
1074 {
1075 struct mfc6_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_KERNEL);
1076 if (!c)
1077 return NULL;
1078 c->mfc_un.res.last_assert = jiffies - MFC_ASSERT_THRESH - 1;
1079 c->mfc_un.res.minvif = MAXMIFS;
1080 return c;
1081 }
1082
1083 static struct mfc6_cache *ip6mr_cache_alloc_unres(void)
1084 {
1085 struct mfc6_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_ATOMIC);
1086 if (!c)
1087 return NULL;
1088 skb_queue_head_init(&c->mfc_un.unres.unresolved);
1089 c->mfc_un.unres.expires = jiffies + 10 * HZ;
1090 return c;
1091 }
1092
1093 /*
1094 * A cache entry has gone into a resolved state from queued
1095 */
1096
1097 static void ip6mr_cache_resolve(struct net *net, struct mr6_table *mrt,
1098 struct mfc6_cache *uc, struct mfc6_cache *c)
1099 {
1100 struct sk_buff *skb;
1101
1102 /*
1103 * Play the pending entries through our router
1104 */
1105
1106 while ((skb = __skb_dequeue(&uc->mfc_un.unres.unresolved))) {
1107 if (ipv6_hdr(skb)->version == 0) {
1108 struct nlmsghdr *nlh = (struct nlmsghdr *)skb_pull(skb, sizeof(struct ipv6hdr));
1109
1110 if (__ip6mr_fill_mroute(mrt, skb, c, nlmsg_data(nlh)) > 0) {
1111 nlh->nlmsg_len = skb_tail_pointer(skb) - (u8 *)nlh;
1112 } else {
1113 nlh->nlmsg_type = NLMSG_ERROR;
1114 nlh->nlmsg_len = nlmsg_msg_size(sizeof(struct nlmsgerr));
1115 skb_trim(skb, nlh->nlmsg_len);
1116 ((struct nlmsgerr *)nlmsg_data(nlh))->error = -EMSGSIZE;
1117 }
1118 rtnl_unicast(skb, net, NETLINK_CB(skb).portid);
1119 } else
1120 ip6_mr_forward(net, mrt, skb, c);
1121 }
1122 }
1123
1124 /*
1125 * Bounce a cache query up to pim6sd. We could use netlink for this but pim6sd
1126 * expects the following bizarre scheme.
1127 *
1128 * Called under mrt_lock.
1129 */
1130
1131 static int ip6mr_cache_report(struct mr6_table *mrt, struct sk_buff *pkt,
1132 mifi_t mifi, int assert)
1133 {
1134 struct sk_buff *skb;
1135 struct mrt6msg *msg;
1136 int ret;
1137
1138 #ifdef CONFIG_IPV6_PIMSM_V2
1139 if (assert == MRT6MSG_WHOLEPKT)
1140 skb = skb_realloc_headroom(pkt, -skb_network_offset(pkt)
1141 +sizeof(*msg));
1142 else
1143 #endif
1144 skb = alloc_skb(sizeof(struct ipv6hdr) + sizeof(*msg), GFP_ATOMIC);
1145
1146 if (!skb)
1147 return -ENOBUFS;
1148
1149 /* I suppose that internal messages
1150 * do not require checksums */
1151
1152 skb->ip_summed = CHECKSUM_UNNECESSARY;
1153
1154 #ifdef CONFIG_IPV6_PIMSM_V2
1155 if (assert == MRT6MSG_WHOLEPKT) {
1156 /* Ugly, but we have no choice with this interface.
1157 Duplicate old header, fix length etc.
1158 And all this only to mangle msg->im6_msgtype and
1159 to set msg->im6_mbz to "mbz" :-)
1160 */
1161 skb_push(skb, -skb_network_offset(pkt));
1162
1163 skb_push(skb, sizeof(*msg));
1164 skb_reset_transport_header(skb);
1165 msg = (struct mrt6msg *)skb_transport_header(skb);
1166 msg->im6_mbz = 0;
1167 msg->im6_msgtype = MRT6MSG_WHOLEPKT;
1168 msg->im6_mif = mrt->mroute_reg_vif_num;
1169 msg->im6_pad = 0;
1170 msg->im6_src = ipv6_hdr(pkt)->saddr;
1171 msg->im6_dst = ipv6_hdr(pkt)->daddr;
1172
1173 skb->ip_summed = CHECKSUM_UNNECESSARY;
1174 } else
1175 #endif
1176 {
1177 /*
1178 * Copy the IP header
1179 */
1180
1181 skb_put(skb, sizeof(struct ipv6hdr));
1182 skb_reset_network_header(skb);
1183 skb_copy_to_linear_data(skb, ipv6_hdr(pkt), sizeof(struct ipv6hdr));
1184
1185 /*
1186 * Add our header
1187 */
1188 skb_put(skb, sizeof(*msg));
1189 skb_reset_transport_header(skb);
1190 msg = (struct mrt6msg *)skb_transport_header(skb);
1191
1192 msg->im6_mbz = 0;
1193 msg->im6_msgtype = assert;
1194 msg->im6_mif = mifi;
1195 msg->im6_pad = 0;
1196 msg->im6_src = ipv6_hdr(pkt)->saddr;
1197 msg->im6_dst = ipv6_hdr(pkt)->daddr;
1198
1199 skb_dst_set(skb, dst_clone(skb_dst(pkt)));
1200 skb->ip_summed = CHECKSUM_UNNECESSARY;
1201 }
1202
1203 if (!mrt->mroute6_sk) {
1204 kfree_skb(skb);
1205 return -EINVAL;
1206 }
1207
1208 /*
1209 * Deliver to user space multicast routing algorithms
1210 */
1211 ret = sock_queue_rcv_skb(mrt->mroute6_sk, skb);
1212 if (ret < 0) {
1213 net_warn_ratelimited("mroute6: pending queue full, dropping entries\n");
1214 kfree_skb(skb);
1215 }
1216
1217 return ret;
1218 }
1219
1220 /*
1221 * Queue a packet for resolution. It gets locked cache entry!
1222 */
1223
1224 static int
1225 ip6mr_cache_unresolved(struct mr6_table *mrt, mifi_t mifi, struct sk_buff *skb)
1226 {
1227 bool found = false;
1228 int err;
1229 struct mfc6_cache *c;
1230
1231 spin_lock_bh(&mfc_unres_lock);
1232 list_for_each_entry(c, &mrt->mfc6_unres_queue, list) {
1233 if (ipv6_addr_equal(&c->mf6c_mcastgrp, &ipv6_hdr(skb)->daddr) &&
1234 ipv6_addr_equal(&c->mf6c_origin, &ipv6_hdr(skb)->saddr)) {
1235 found = true;
1236 break;
1237 }
1238 }
1239
1240 if (!found) {
1241 /*
1242 * Create a new entry if allowable
1243 */
1244
1245 if (atomic_read(&mrt->cache_resolve_queue_len) >= 10 ||
1246 (c = ip6mr_cache_alloc_unres()) == NULL) {
1247 spin_unlock_bh(&mfc_unres_lock);
1248
1249 kfree_skb(skb);
1250 return -ENOBUFS;
1251 }
1252
1253 /*
1254 * Fill in the new cache entry
1255 */
1256 c->mf6c_parent = -1;
1257 c->mf6c_origin = ipv6_hdr(skb)->saddr;
1258 c->mf6c_mcastgrp = ipv6_hdr(skb)->daddr;
1259
1260 /*
1261 * Reflect first query at pim6sd
1262 */
1263 err = ip6mr_cache_report(mrt, skb, mifi, MRT6MSG_NOCACHE);
1264 if (err < 0) {
1265 /* If the report failed throw the cache entry
1266 out - Brad Parker
1267 */
1268 spin_unlock_bh(&mfc_unres_lock);
1269
1270 ip6mr_cache_free(c);
1271 kfree_skb(skb);
1272 return err;
1273 }
1274
1275 atomic_inc(&mrt->cache_resolve_queue_len);
1276 list_add(&c->list, &mrt->mfc6_unres_queue);
1277 mr6_netlink_event(mrt, c, RTM_NEWROUTE);
1278
1279 ipmr_do_expire_process(mrt);
1280 }
1281
1282 /*
1283 * See if we can append the packet
1284 */
1285 if (c->mfc_un.unres.unresolved.qlen > 3) {
1286 kfree_skb(skb);
1287 err = -ENOBUFS;
1288 } else {
1289 skb_queue_tail(&c->mfc_un.unres.unresolved, skb);
1290 err = 0;
1291 }
1292
1293 spin_unlock_bh(&mfc_unres_lock);
1294 return err;
1295 }
1296
1297 /*
1298 * MFC6 cache manipulation by user space
1299 */
1300
1301 static int ip6mr_mfc_delete(struct mr6_table *mrt, struct mf6cctl *mfc,
1302 int parent)
1303 {
1304 int line;
1305 struct mfc6_cache *c, *next;
1306
1307 line = MFC6_HASH(&mfc->mf6cc_mcastgrp.sin6_addr, &mfc->mf6cc_origin.sin6_addr);
1308
1309 list_for_each_entry_safe(c, next, &mrt->mfc6_cache_array[line], list) {
1310 if (ipv6_addr_equal(&c->mf6c_origin, &mfc->mf6cc_origin.sin6_addr) &&
1311 ipv6_addr_equal(&c->mf6c_mcastgrp,
1312 &mfc->mf6cc_mcastgrp.sin6_addr) &&
1313 (parent == -1 || parent == c->mf6c_parent)) {
1314 write_lock_bh(&mrt_lock);
1315 list_del(&c->list);
1316 write_unlock_bh(&mrt_lock);
1317
1318 mr6_netlink_event(mrt, c, RTM_DELROUTE);
1319 ip6mr_cache_free(c);
1320 return 0;
1321 }
1322 }
1323 return -ENOENT;
1324 }
1325
1326 static int ip6mr_device_event(struct notifier_block *this,
1327 unsigned long event, void *ptr)
1328 {
1329 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1330 struct net *net = dev_net(dev);
1331 struct mr6_table *mrt;
1332 struct mif_device *v;
1333 int ct;
1334 LIST_HEAD(list);
1335
1336 if (event != NETDEV_UNREGISTER)
1337 return NOTIFY_DONE;
1338
1339 ip6mr_for_each_table(mrt, net) {
1340 v = &mrt->vif6_table[0];
1341 for (ct = 0; ct < mrt->maxvif; ct++, v++) {
1342 if (v->dev == dev)
1343 mif6_delete(mrt, ct, &list);
1344 }
1345 }
1346 unregister_netdevice_many(&list);
1347
1348 return NOTIFY_DONE;
1349 }
1350
1351 static struct notifier_block ip6_mr_notifier = {
1352 .notifier_call = ip6mr_device_event
1353 };
1354
1355 /*
1356 * Setup for IP multicast routing
1357 */
1358
1359 static int __net_init ip6mr_net_init(struct net *net)
1360 {
1361 int err;
1362
1363 err = ip6mr_rules_init(net);
1364 if (err < 0)
1365 goto fail;
1366
1367 #ifdef CONFIG_PROC_FS
1368 err = -ENOMEM;
1369 if (!proc_create("ip6_mr_vif", 0, net->proc_net, &ip6mr_vif_fops))
1370 goto proc_vif_fail;
1371 if (!proc_create("ip6_mr_cache", 0, net->proc_net, &ip6mr_mfc_fops))
1372 goto proc_cache_fail;
1373 #endif
1374
1375 return 0;
1376
1377 #ifdef CONFIG_PROC_FS
1378 proc_cache_fail:
1379 remove_proc_entry("ip6_mr_vif", net->proc_net);
1380 proc_vif_fail:
1381 ip6mr_rules_exit(net);
1382 #endif
1383 fail:
1384 return err;
1385 }
1386
1387 static void __net_exit ip6mr_net_exit(struct net *net)
1388 {
1389 #ifdef CONFIG_PROC_FS
1390 remove_proc_entry("ip6_mr_cache", net->proc_net);
1391 remove_proc_entry("ip6_mr_vif", net->proc_net);
1392 #endif
1393 ip6mr_rules_exit(net);
1394 }
1395
1396 static struct pernet_operations ip6mr_net_ops = {
1397 .init = ip6mr_net_init,
1398 .exit = ip6mr_net_exit,
1399 };
1400
1401 int __init ip6_mr_init(void)
1402 {
1403 int err;
1404
1405 mrt_cachep = kmem_cache_create("ip6_mrt_cache",
1406 sizeof(struct mfc6_cache),
1407 0, SLAB_HWCACHE_ALIGN,
1408 NULL);
1409 if (!mrt_cachep)
1410 return -ENOMEM;
1411
1412 err = register_pernet_subsys(&ip6mr_net_ops);
1413 if (err)
1414 goto reg_pernet_fail;
1415
1416 err = register_netdevice_notifier(&ip6_mr_notifier);
1417 if (err)
1418 goto reg_notif_fail;
1419 #ifdef CONFIG_IPV6_PIMSM_V2
1420 if (inet6_add_protocol(&pim6_protocol, IPPROTO_PIM) < 0) {
1421 pr_err("%s: can't add PIM protocol\n", __func__);
1422 err = -EAGAIN;
1423 goto add_proto_fail;
1424 }
1425 #endif
1426 rtnl_register(RTNL_FAMILY_IP6MR, RTM_GETROUTE, NULL,
1427 ip6mr_rtm_dumproute, NULL);
1428 return 0;
1429 #ifdef CONFIG_IPV6_PIMSM_V2
1430 add_proto_fail:
1431 unregister_netdevice_notifier(&ip6_mr_notifier);
1432 #endif
1433 reg_notif_fail:
1434 unregister_pernet_subsys(&ip6mr_net_ops);
1435 reg_pernet_fail:
1436 kmem_cache_destroy(mrt_cachep);
1437 return err;
1438 }
1439
1440 void ip6_mr_cleanup(void)
1441 {
1442 rtnl_unregister(RTNL_FAMILY_IP6MR, RTM_GETROUTE);
1443 #ifdef CONFIG_IPV6_PIMSM_V2
1444 inet6_del_protocol(&pim6_protocol, IPPROTO_PIM);
1445 #endif
1446 unregister_netdevice_notifier(&ip6_mr_notifier);
1447 unregister_pernet_subsys(&ip6mr_net_ops);
1448 kmem_cache_destroy(mrt_cachep);
1449 }
1450
1451 static int ip6mr_mfc_add(struct net *net, struct mr6_table *mrt,
1452 struct mf6cctl *mfc, int mrtsock, int parent)
1453 {
1454 bool found = false;
1455 int line;
1456 struct mfc6_cache *uc, *c;
1457 unsigned char ttls[MAXMIFS];
1458 int i;
1459
1460 if (mfc->mf6cc_parent >= MAXMIFS)
1461 return -ENFILE;
1462
1463 memset(ttls, 255, MAXMIFS);
1464 for (i = 0; i < MAXMIFS; i++) {
1465 if (IF_ISSET(i, &mfc->mf6cc_ifset))
1466 ttls[i] = 1;
1467
1468 }
1469
1470 line = MFC6_HASH(&mfc->mf6cc_mcastgrp.sin6_addr, &mfc->mf6cc_origin.sin6_addr);
1471
1472 list_for_each_entry(c, &mrt->mfc6_cache_array[line], list) {
1473 if (ipv6_addr_equal(&c->mf6c_origin, &mfc->mf6cc_origin.sin6_addr) &&
1474 ipv6_addr_equal(&c->mf6c_mcastgrp,
1475 &mfc->mf6cc_mcastgrp.sin6_addr) &&
1476 (parent == -1 || parent == mfc->mf6cc_parent)) {
1477 found = true;
1478 break;
1479 }
1480 }
1481
1482 if (found) {
1483 write_lock_bh(&mrt_lock);
1484 c->mf6c_parent = mfc->mf6cc_parent;
1485 ip6mr_update_thresholds(mrt, c, ttls);
1486 if (!mrtsock)
1487 c->mfc_flags |= MFC_STATIC;
1488 write_unlock_bh(&mrt_lock);
1489 mr6_netlink_event(mrt, c, RTM_NEWROUTE);
1490 return 0;
1491 }
1492
1493 if (!ipv6_addr_any(&mfc->mf6cc_mcastgrp.sin6_addr) &&
1494 !ipv6_addr_is_multicast(&mfc->mf6cc_mcastgrp.sin6_addr))
1495 return -EINVAL;
1496
1497 c = ip6mr_cache_alloc();
1498 if (!c)
1499 return -ENOMEM;
1500
1501 c->mf6c_origin = mfc->mf6cc_origin.sin6_addr;
1502 c->mf6c_mcastgrp = mfc->mf6cc_mcastgrp.sin6_addr;
1503 c->mf6c_parent = mfc->mf6cc_parent;
1504 ip6mr_update_thresholds(mrt, c, ttls);
1505 if (!mrtsock)
1506 c->mfc_flags |= MFC_STATIC;
1507
1508 write_lock_bh(&mrt_lock);
1509 list_add(&c->list, &mrt->mfc6_cache_array[line]);
1510 write_unlock_bh(&mrt_lock);
1511
1512 /*
1513 * Check to see if we resolved a queued list. If so we
1514 * need to send on the frames and tidy up.
1515 */
1516 found = false;
1517 spin_lock_bh(&mfc_unres_lock);
1518 list_for_each_entry(uc, &mrt->mfc6_unres_queue, list) {
1519 if (ipv6_addr_equal(&uc->mf6c_origin, &c->mf6c_origin) &&
1520 ipv6_addr_equal(&uc->mf6c_mcastgrp, &c->mf6c_mcastgrp)) {
1521 list_del(&uc->list);
1522 atomic_dec(&mrt->cache_resolve_queue_len);
1523 found = true;
1524 break;
1525 }
1526 }
1527 if (list_empty(&mrt->mfc6_unres_queue))
1528 del_timer(&mrt->ipmr_expire_timer);
1529 spin_unlock_bh(&mfc_unres_lock);
1530
1531 if (found) {
1532 ip6mr_cache_resolve(net, mrt, uc, c);
1533 ip6mr_cache_free(uc);
1534 }
1535 mr6_netlink_event(mrt, c, RTM_NEWROUTE);
1536 return 0;
1537 }
1538
1539 /*
1540 * Close the multicast socket, and clear the vif tables etc
1541 */
1542
1543 static void mroute_clean_tables(struct mr6_table *mrt, bool all)
1544 {
1545 int i;
1546 LIST_HEAD(list);
1547 struct mfc6_cache *c, *next;
1548
1549 /*
1550 * Shut down all active vif entries
1551 */
1552 for (i = 0; i < mrt->maxvif; i++) {
1553 if (!all && (mrt->vif6_table[i].flags & VIFF_STATIC))
1554 continue;
1555 mif6_delete(mrt, i, &list);
1556 }
1557 unregister_netdevice_many(&list);
1558
1559 /*
1560 * Wipe the cache
1561 */
1562 for (i = 0; i < MFC6_LINES; i++) {
1563 list_for_each_entry_safe(c, next, &mrt->mfc6_cache_array[i], list) {
1564 if (!all && (c->mfc_flags & MFC_STATIC))
1565 continue;
1566 write_lock_bh(&mrt_lock);
1567 list_del(&c->list);
1568 write_unlock_bh(&mrt_lock);
1569
1570 mr6_netlink_event(mrt, c, RTM_DELROUTE);
1571 ip6mr_cache_free(c);
1572 }
1573 }
1574
1575 if (atomic_read(&mrt->cache_resolve_queue_len) != 0) {
1576 spin_lock_bh(&mfc_unres_lock);
1577 list_for_each_entry_safe(c, next, &mrt->mfc6_unres_queue, list) {
1578 list_del(&c->list);
1579 mr6_netlink_event(mrt, c, RTM_DELROUTE);
1580 ip6mr_destroy_unres(mrt, c);
1581 }
1582 spin_unlock_bh(&mfc_unres_lock);
1583 }
1584 }
1585
1586 static int ip6mr_sk_init(struct mr6_table *mrt, struct sock *sk)
1587 {
1588 int err = 0;
1589 struct net *net = sock_net(sk);
1590
1591 rtnl_lock();
1592 write_lock_bh(&mrt_lock);
1593 if (likely(mrt->mroute6_sk == NULL)) {
1594 mrt->mroute6_sk = sk;
1595 net->ipv6.devconf_all->mc_forwarding++;
1596 } else {
1597 err = -EADDRINUSE;
1598 }
1599 write_unlock_bh(&mrt_lock);
1600
1601 if (!err)
1602 inet6_netconf_notify_devconf(net, NETCONFA_MC_FORWARDING,
1603 NETCONFA_IFINDEX_ALL,
1604 net->ipv6.devconf_all);
1605 rtnl_unlock();
1606
1607 return err;
1608 }
1609
1610 int ip6mr_sk_done(struct sock *sk)
1611 {
1612 int err = -EACCES;
1613 struct net *net = sock_net(sk);
1614 struct mr6_table *mrt;
1615
1616 rtnl_lock();
1617 ip6mr_for_each_table(mrt, net) {
1618 if (sk == mrt->mroute6_sk) {
1619 write_lock_bh(&mrt_lock);
1620 mrt->mroute6_sk = NULL;
1621 net->ipv6.devconf_all->mc_forwarding--;
1622 write_unlock_bh(&mrt_lock);
1623 inet6_netconf_notify_devconf(net,
1624 NETCONFA_MC_FORWARDING,
1625 NETCONFA_IFINDEX_ALL,
1626 net->ipv6.devconf_all);
1627
1628 mroute_clean_tables(mrt, false);
1629 err = 0;
1630 break;
1631 }
1632 }
1633 rtnl_unlock();
1634
1635 return err;
1636 }
1637
1638 struct sock *mroute6_socket(struct net *net, struct sk_buff *skb)
1639 {
1640 struct mr6_table *mrt;
1641 struct flowi6 fl6 = {
1642 .flowi6_iif = skb->skb_iif ? : LOOPBACK_IFINDEX,
1643 .flowi6_oif = skb->dev->ifindex,
1644 .flowi6_mark = skb->mark,
1645 };
1646
1647 if (ip6mr_fib_lookup(net, &fl6, &mrt) < 0)
1648 return NULL;
1649
1650 return mrt->mroute6_sk;
1651 }
1652
1653 /*
1654 * Socket options and virtual interface manipulation. The whole
1655 * virtual interface system is a complete heap, but unfortunately
1656 * that's how BSD mrouted happens to think. Maybe one day with a proper
1657 * MOSPF/PIM router set up we can clean this up.
1658 */
1659
1660 int ip6_mroute_setsockopt(struct sock *sk, int optname, char __user *optval, unsigned int optlen)
1661 {
1662 int ret, parent = 0;
1663 struct mif6ctl vif;
1664 struct mf6cctl mfc;
1665 mifi_t mifi;
1666 struct net *net = sock_net(sk);
1667 struct mr6_table *mrt;
1668
1669 mrt = ip6mr_get_table(net, raw6_sk(sk)->ip6mr_table ? : RT6_TABLE_DFLT);
1670 if (!mrt)
1671 return -ENOENT;
1672
1673 if (optname != MRT6_INIT) {
1674 if (sk != mrt->mroute6_sk && !ns_capable(net->user_ns, CAP_NET_ADMIN))
1675 return -EACCES;
1676 }
1677
1678 switch (optname) {
1679 case MRT6_INIT:
1680 if (sk->sk_type != SOCK_RAW ||
1681 inet_sk(sk)->inet_num != IPPROTO_ICMPV6)
1682 return -EOPNOTSUPP;
1683 if (optlen < sizeof(int))
1684 return -EINVAL;
1685
1686 return ip6mr_sk_init(mrt, sk);
1687
1688 case MRT6_DONE:
1689 return ip6mr_sk_done(sk);
1690
1691 case MRT6_ADD_MIF:
1692 if (optlen < sizeof(vif))
1693 return -EINVAL;
1694 if (copy_from_user(&vif, optval, sizeof(vif)))
1695 return -EFAULT;
1696 if (vif.mif6c_mifi >= MAXMIFS)
1697 return -ENFILE;
1698 rtnl_lock();
1699 ret = mif6_add(net, mrt, &vif, sk == mrt->mroute6_sk);
1700 rtnl_unlock();
1701 return ret;
1702
1703 case MRT6_DEL_MIF:
1704 if (optlen < sizeof(mifi_t))
1705 return -EINVAL;
1706 if (copy_from_user(&mifi, optval, sizeof(mifi_t)))
1707 return -EFAULT;
1708 rtnl_lock();
1709 ret = mif6_delete(mrt, mifi, NULL);
1710 rtnl_unlock();
1711 return ret;
1712
1713 /*
1714 * Manipulate the forwarding caches. These live
1715 * in a sort of kernel/user symbiosis.
1716 */
1717 case MRT6_ADD_MFC:
1718 case MRT6_DEL_MFC:
1719 parent = -1;
1720 case MRT6_ADD_MFC_PROXY:
1721 case MRT6_DEL_MFC_PROXY:
1722 if (optlen < sizeof(mfc))
1723 return -EINVAL;
1724 if (copy_from_user(&mfc, optval, sizeof(mfc)))
1725 return -EFAULT;
1726 if (parent == 0)
1727 parent = mfc.mf6cc_parent;
1728 rtnl_lock();
1729 if (optname == MRT6_DEL_MFC || optname == MRT6_DEL_MFC_PROXY)
1730 ret = ip6mr_mfc_delete(mrt, &mfc, parent);
1731 else
1732 ret = ip6mr_mfc_add(net, mrt, &mfc,
1733 sk == mrt->mroute6_sk, parent);
1734 rtnl_unlock();
1735 return ret;
1736
1737 /*
1738 * Control PIM assert (to activate pim will activate assert)
1739 */
1740 case MRT6_ASSERT:
1741 {
1742 int v;
1743
1744 if (optlen != sizeof(v))
1745 return -EINVAL;
1746 if (get_user(v, (int __user *)optval))
1747 return -EFAULT;
1748 mrt->mroute_do_assert = v;
1749 return 0;
1750 }
1751
1752 #ifdef CONFIG_IPV6_PIMSM_V2
1753 case MRT6_PIM:
1754 {
1755 int v;
1756
1757 if (optlen != sizeof(v))
1758 return -EINVAL;
1759 if (get_user(v, (int __user *)optval))
1760 return -EFAULT;
1761 v = !!v;
1762 rtnl_lock();
1763 ret = 0;
1764 if (v != mrt->mroute_do_pim) {
1765 mrt->mroute_do_pim = v;
1766 mrt->mroute_do_assert = v;
1767 }
1768 rtnl_unlock();
1769 return ret;
1770 }
1771
1772 #endif
1773 #ifdef CONFIG_IPV6_MROUTE_MULTIPLE_TABLES
1774 case MRT6_TABLE:
1775 {
1776 u32 v;
1777
1778 if (optlen != sizeof(u32))
1779 return -EINVAL;
1780 if (get_user(v, (u32 __user *)optval))
1781 return -EFAULT;
1782 /* "pim6reg%u" should not exceed 16 bytes (IFNAMSIZ) */
1783 if (v != RT_TABLE_DEFAULT && v >= 100000000)
1784 return -EINVAL;
1785 if (sk == mrt->mroute6_sk)
1786 return -EBUSY;
1787
1788 rtnl_lock();
1789 ret = 0;
1790 if (!ip6mr_new_table(net, v))
1791 ret = -ENOMEM;
1792 raw6_sk(sk)->ip6mr_table = v;
1793 rtnl_unlock();
1794 return ret;
1795 }
1796 #endif
1797 /*
1798 * Spurious command, or MRT6_VERSION which you cannot
1799 * set.
1800 */
1801 default:
1802 return -ENOPROTOOPT;
1803 }
1804 }
1805
1806 /*
1807 * Getsock opt support for the multicast routing system.
1808 */
1809
1810 int ip6_mroute_getsockopt(struct sock *sk, int optname, char __user *optval,
1811 int __user *optlen)
1812 {
1813 int olr;
1814 int val;
1815 struct net *net = sock_net(sk);
1816 struct mr6_table *mrt;
1817
1818 mrt = ip6mr_get_table(net, raw6_sk(sk)->ip6mr_table ? : RT6_TABLE_DFLT);
1819 if (!mrt)
1820 return -ENOENT;
1821
1822 switch (optname) {
1823 case MRT6_VERSION:
1824 val = 0x0305;
1825 break;
1826 #ifdef CONFIG_IPV6_PIMSM_V2
1827 case MRT6_PIM:
1828 val = mrt->mroute_do_pim;
1829 break;
1830 #endif
1831 case MRT6_ASSERT:
1832 val = mrt->mroute_do_assert;
1833 break;
1834 default:
1835 return -ENOPROTOOPT;
1836 }
1837
1838 if (get_user(olr, optlen))
1839 return -EFAULT;
1840
1841 olr = min_t(int, olr, sizeof(int));
1842 if (olr < 0)
1843 return -EINVAL;
1844
1845 if (put_user(olr, optlen))
1846 return -EFAULT;
1847 if (copy_to_user(optval, &val, olr))
1848 return -EFAULT;
1849 return 0;
1850 }
1851
1852 /*
1853 * The IP multicast ioctl support routines.
1854 */
1855
1856 int ip6mr_ioctl(struct sock *sk, int cmd, void __user *arg)
1857 {
1858 struct sioc_sg_req6 sr;
1859 struct sioc_mif_req6 vr;
1860 struct mif_device *vif;
1861 struct mfc6_cache *c;
1862 struct net *net = sock_net(sk);
1863 struct mr6_table *mrt;
1864
1865 mrt = ip6mr_get_table(net, raw6_sk(sk)->ip6mr_table ? : RT6_TABLE_DFLT);
1866 if (!mrt)
1867 return -ENOENT;
1868
1869 switch (cmd) {
1870 case SIOCGETMIFCNT_IN6:
1871 if (copy_from_user(&vr, arg, sizeof(vr)))
1872 return -EFAULT;
1873 if (vr.mifi >= mrt->maxvif)
1874 return -EINVAL;
1875 read_lock(&mrt_lock);
1876 vif = &mrt->vif6_table[vr.mifi];
1877 if (MIF_EXISTS(mrt, vr.mifi)) {
1878 vr.icount = vif->pkt_in;
1879 vr.ocount = vif->pkt_out;
1880 vr.ibytes = vif->bytes_in;
1881 vr.obytes = vif->bytes_out;
1882 read_unlock(&mrt_lock);
1883
1884 if (copy_to_user(arg, &vr, sizeof(vr)))
1885 return -EFAULT;
1886 return 0;
1887 }
1888 read_unlock(&mrt_lock);
1889 return -EADDRNOTAVAIL;
1890 case SIOCGETSGCNT_IN6:
1891 if (copy_from_user(&sr, arg, sizeof(sr)))
1892 return -EFAULT;
1893
1894 read_lock(&mrt_lock);
1895 c = ip6mr_cache_find(mrt, &sr.src.sin6_addr, &sr.grp.sin6_addr);
1896 if (c) {
1897 sr.pktcnt = c->mfc_un.res.pkt;
1898 sr.bytecnt = c->mfc_un.res.bytes;
1899 sr.wrong_if = c->mfc_un.res.wrong_if;
1900 read_unlock(&mrt_lock);
1901
1902 if (copy_to_user(arg, &sr, sizeof(sr)))
1903 return -EFAULT;
1904 return 0;
1905 }
1906 read_unlock(&mrt_lock);
1907 return -EADDRNOTAVAIL;
1908 default:
1909 return -ENOIOCTLCMD;
1910 }
1911 }
1912
1913 #ifdef CONFIG_COMPAT
1914 struct compat_sioc_sg_req6 {
1915 struct sockaddr_in6 src;
1916 struct sockaddr_in6 grp;
1917 compat_ulong_t pktcnt;
1918 compat_ulong_t bytecnt;
1919 compat_ulong_t wrong_if;
1920 };
1921
1922 struct compat_sioc_mif_req6 {
1923 mifi_t mifi;
1924 compat_ulong_t icount;
1925 compat_ulong_t ocount;
1926 compat_ulong_t ibytes;
1927 compat_ulong_t obytes;
1928 };
1929
1930 int ip6mr_compat_ioctl(struct sock *sk, unsigned int cmd, void __user *arg)
1931 {
1932 struct compat_sioc_sg_req6 sr;
1933 struct compat_sioc_mif_req6 vr;
1934 struct mif_device *vif;
1935 struct mfc6_cache *c;
1936 struct net *net = sock_net(sk);
1937 struct mr6_table *mrt;
1938
1939 mrt = ip6mr_get_table(net, raw6_sk(sk)->ip6mr_table ? : RT6_TABLE_DFLT);
1940 if (!mrt)
1941 return -ENOENT;
1942
1943 switch (cmd) {
1944 case SIOCGETMIFCNT_IN6:
1945 if (copy_from_user(&vr, arg, sizeof(vr)))
1946 return -EFAULT;
1947 if (vr.mifi >= mrt->maxvif)
1948 return -EINVAL;
1949 read_lock(&mrt_lock);
1950 vif = &mrt->vif6_table[vr.mifi];
1951 if (MIF_EXISTS(mrt, vr.mifi)) {
1952 vr.icount = vif->pkt_in;
1953 vr.ocount = vif->pkt_out;
1954 vr.ibytes = vif->bytes_in;
1955 vr.obytes = vif->bytes_out;
1956 read_unlock(&mrt_lock);
1957
1958 if (copy_to_user(arg, &vr, sizeof(vr)))
1959 return -EFAULT;
1960 return 0;
1961 }
1962 read_unlock(&mrt_lock);
1963 return -EADDRNOTAVAIL;
1964 case SIOCGETSGCNT_IN6:
1965 if (copy_from_user(&sr, arg, sizeof(sr)))
1966 return -EFAULT;
1967
1968 read_lock(&mrt_lock);
1969 c = ip6mr_cache_find(mrt, &sr.src.sin6_addr, &sr.grp.sin6_addr);
1970 if (c) {
1971 sr.pktcnt = c->mfc_un.res.pkt;
1972 sr.bytecnt = c->mfc_un.res.bytes;
1973 sr.wrong_if = c->mfc_un.res.wrong_if;
1974 read_unlock(&mrt_lock);
1975
1976 if (copy_to_user(arg, &sr, sizeof(sr)))
1977 return -EFAULT;
1978 return 0;
1979 }
1980 read_unlock(&mrt_lock);
1981 return -EADDRNOTAVAIL;
1982 default:
1983 return -ENOIOCTLCMD;
1984 }
1985 }
1986 #endif
1987
1988 static inline int ip6mr_forward2_finish(struct net *net, struct sock *sk, struct sk_buff *skb)
1989 {
1990 __IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)),
1991 IPSTATS_MIB_OUTFORWDATAGRAMS);
1992 __IP6_ADD_STATS(net, ip6_dst_idev(skb_dst(skb)),
1993 IPSTATS_MIB_OUTOCTETS, skb->len);
1994 return dst_output(net, sk, skb);
1995 }
1996
1997 /*
1998 * Processing handlers for ip6mr_forward
1999 */
2000
2001 static int ip6mr_forward2(struct net *net, struct mr6_table *mrt,
2002 struct sk_buff *skb, struct mfc6_cache *c, int vifi)
2003 {
2004 struct ipv6hdr *ipv6h;
2005 struct mif_device *vif = &mrt->vif6_table[vifi];
2006 struct net_device *dev;
2007 struct dst_entry *dst;
2008 struct flowi6 fl6;
2009
2010 if (!vif->dev)
2011 goto out_free;
2012
2013 #ifdef CONFIG_IPV6_PIMSM_V2
2014 if (vif->flags & MIFF_REGISTER) {
2015 vif->pkt_out++;
2016 vif->bytes_out += skb->len;
2017 vif->dev->stats.tx_bytes += skb->len;
2018 vif->dev->stats.tx_packets++;
2019 ip6mr_cache_report(mrt, skb, vifi, MRT6MSG_WHOLEPKT);
2020 goto out_free;
2021 }
2022 #endif
2023
2024 ipv6h = ipv6_hdr(skb);
2025
2026 fl6 = (struct flowi6) {
2027 .flowi6_oif = vif->link,
2028 .daddr = ipv6h->daddr,
2029 };
2030
2031 dst = ip6_route_output(net, NULL, &fl6);
2032 if (dst->error) {
2033 dst_release(dst);
2034 goto out_free;
2035 }
2036
2037 skb_dst_drop(skb);
2038 skb_dst_set(skb, dst);
2039
2040 /*
2041 * RFC1584 teaches, that DVMRP/PIM router must deliver packets locally
2042 * not only before forwarding, but after forwarding on all output
2043 * interfaces. It is clear, if mrouter runs a multicasting
2044 * program, it should receive packets not depending to what interface
2045 * program is joined.
2046 * If we will not make it, the program will have to join on all
2047 * interfaces. On the other hand, multihoming host (or router, but
2048 * not mrouter) cannot join to more than one interface - it will
2049 * result in receiving multiple packets.
2050 */
2051 dev = vif->dev;
2052 skb->dev = dev;
2053 vif->pkt_out++;
2054 vif->bytes_out += skb->len;
2055
2056 /* We are about to write */
2057 /* XXX: extension headers? */
2058 if (skb_cow(skb, sizeof(*ipv6h) + LL_RESERVED_SPACE(dev)))
2059 goto out_free;
2060
2061 ipv6h = ipv6_hdr(skb);
2062 ipv6h->hop_limit--;
2063
2064 IP6CB(skb)->flags |= IP6SKB_FORWARDED;
2065
2066 return NF_HOOK(NFPROTO_IPV6, NF_INET_FORWARD,
2067 net, NULL, skb, skb->dev, dev,
2068 ip6mr_forward2_finish);
2069
2070 out_free:
2071 kfree_skb(skb);
2072 return 0;
2073 }
2074
2075 static int ip6mr_find_vif(struct mr6_table *mrt, struct net_device *dev)
2076 {
2077 int ct;
2078
2079 for (ct = mrt->maxvif - 1; ct >= 0; ct--) {
2080 if (mrt->vif6_table[ct].dev == dev)
2081 break;
2082 }
2083 return ct;
2084 }
2085
2086 static void ip6_mr_forward(struct net *net, struct mr6_table *mrt,
2087 struct sk_buff *skb, struct mfc6_cache *cache)
2088 {
2089 int psend = -1;
2090 int vif, ct;
2091 int true_vifi = ip6mr_find_vif(mrt, skb->dev);
2092
2093 vif = cache->mf6c_parent;
2094 cache->mfc_un.res.pkt++;
2095 cache->mfc_un.res.bytes += skb->len;
2096 cache->mfc_un.res.lastuse = jiffies;
2097
2098 if (ipv6_addr_any(&cache->mf6c_origin) && true_vifi >= 0) {
2099 struct mfc6_cache *cache_proxy;
2100
2101 /* For an (*,G) entry, we only check that the incoming
2102 * interface is part of the static tree.
2103 */
2104 cache_proxy = ip6mr_cache_find_any_parent(mrt, vif);
2105 if (cache_proxy &&
2106 cache_proxy->mfc_un.res.ttls[true_vifi] < 255)
2107 goto forward;
2108 }
2109
2110 /*
2111 * Wrong interface: drop packet and (maybe) send PIM assert.
2112 */
2113 if (mrt->vif6_table[vif].dev != skb->dev) {
2114 cache->mfc_un.res.wrong_if++;
2115
2116 if (true_vifi >= 0 && mrt->mroute_do_assert &&
2117 /* pimsm uses asserts, when switching from RPT to SPT,
2118 so that we cannot check that packet arrived on an oif.
2119 It is bad, but otherwise we would need to move pretty
2120 large chunk of pimd to kernel. Ough... --ANK
2121 */
2122 (mrt->mroute_do_pim ||
2123 cache->mfc_un.res.ttls[true_vifi] < 255) &&
2124 time_after(jiffies,
2125 cache->mfc_un.res.last_assert + MFC_ASSERT_THRESH)) {
2126 cache->mfc_un.res.last_assert = jiffies;
2127 ip6mr_cache_report(mrt, skb, true_vifi, MRT6MSG_WRONGMIF);
2128 }
2129 goto dont_forward;
2130 }
2131
2132 forward:
2133 mrt->vif6_table[vif].pkt_in++;
2134 mrt->vif6_table[vif].bytes_in += skb->len;
2135
2136 /*
2137 * Forward the frame
2138 */
2139 if (ipv6_addr_any(&cache->mf6c_origin) &&
2140 ipv6_addr_any(&cache->mf6c_mcastgrp)) {
2141 if (true_vifi >= 0 &&
2142 true_vifi != cache->mf6c_parent &&
2143 ipv6_hdr(skb)->hop_limit >
2144 cache->mfc_un.res.ttls[cache->mf6c_parent]) {
2145 /* It's an (*,*) entry and the packet is not coming from
2146 * the upstream: forward the packet to the upstream
2147 * only.
2148 */
2149 psend = cache->mf6c_parent;
2150 goto last_forward;
2151 }
2152 goto dont_forward;
2153 }
2154 for (ct = cache->mfc_un.res.maxvif - 1; ct >= cache->mfc_un.res.minvif; ct--) {
2155 /* For (*,G) entry, don't forward to the incoming interface */
2156 if ((!ipv6_addr_any(&cache->mf6c_origin) || ct != true_vifi) &&
2157 ipv6_hdr(skb)->hop_limit > cache->mfc_un.res.ttls[ct]) {
2158 if (psend != -1) {
2159 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
2160 if (skb2)
2161 ip6mr_forward2(net, mrt, skb2, cache, psend);
2162 }
2163 psend = ct;
2164 }
2165 }
2166 last_forward:
2167 if (psend != -1) {
2168 ip6mr_forward2(net, mrt, skb, cache, psend);
2169 return;
2170 }
2171
2172 dont_forward:
2173 kfree_skb(skb);
2174 }
2175
2176
2177 /*
2178 * Multicast packets for forwarding arrive here
2179 */
2180
2181 int ip6_mr_input(struct sk_buff *skb)
2182 {
2183 struct mfc6_cache *cache;
2184 struct net *net = dev_net(skb->dev);
2185 struct mr6_table *mrt;
2186 struct flowi6 fl6 = {
2187 .flowi6_iif = skb->dev->ifindex,
2188 .flowi6_mark = skb->mark,
2189 };
2190 int err;
2191
2192 err = ip6mr_fib_lookup(net, &fl6, &mrt);
2193 if (err < 0) {
2194 kfree_skb(skb);
2195 return err;
2196 }
2197
2198 read_lock(&mrt_lock);
2199 cache = ip6mr_cache_find(mrt,
2200 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr);
2201 if (!cache) {
2202 int vif = ip6mr_find_vif(mrt, skb->dev);
2203
2204 if (vif >= 0)
2205 cache = ip6mr_cache_find_any(mrt,
2206 &ipv6_hdr(skb)->daddr,
2207 vif);
2208 }
2209
2210 /*
2211 * No usable cache entry
2212 */
2213 if (!cache) {
2214 int vif;
2215
2216 vif = ip6mr_find_vif(mrt, skb->dev);
2217 if (vif >= 0) {
2218 int err = ip6mr_cache_unresolved(mrt, vif, skb);
2219 read_unlock(&mrt_lock);
2220
2221 return err;
2222 }
2223 read_unlock(&mrt_lock);
2224 kfree_skb(skb);
2225 return -ENODEV;
2226 }
2227
2228 ip6_mr_forward(net, mrt, skb, cache);
2229
2230 read_unlock(&mrt_lock);
2231
2232 return 0;
2233 }
2234
2235
2236 static int __ip6mr_fill_mroute(struct mr6_table *mrt, struct sk_buff *skb,
2237 struct mfc6_cache *c, struct rtmsg *rtm)
2238 {
2239 struct rta_mfc_stats mfcs;
2240 struct nlattr *mp_attr;
2241 struct rtnexthop *nhp;
2242 unsigned long lastuse;
2243 int ct;
2244
2245 /* If cache is unresolved, don't try to parse IIF and OIF */
2246 if (c->mf6c_parent >= MAXMIFS)
2247 return -ENOENT;
2248
2249 if (MIF_EXISTS(mrt, c->mf6c_parent) &&
2250 nla_put_u32(skb, RTA_IIF, mrt->vif6_table[c->mf6c_parent].dev->ifindex) < 0)
2251 return -EMSGSIZE;
2252 mp_attr = nla_nest_start(skb, RTA_MULTIPATH);
2253 if (!mp_attr)
2254 return -EMSGSIZE;
2255
2256 for (ct = c->mfc_un.res.minvif; ct < c->mfc_un.res.maxvif; ct++) {
2257 if (MIF_EXISTS(mrt, ct) && c->mfc_un.res.ttls[ct] < 255) {
2258 nhp = nla_reserve_nohdr(skb, sizeof(*nhp));
2259 if (!nhp) {
2260 nla_nest_cancel(skb, mp_attr);
2261 return -EMSGSIZE;
2262 }
2263
2264 nhp->rtnh_flags = 0;
2265 nhp->rtnh_hops = c->mfc_un.res.ttls[ct];
2266 nhp->rtnh_ifindex = mrt->vif6_table[ct].dev->ifindex;
2267 nhp->rtnh_len = sizeof(*nhp);
2268 }
2269 }
2270
2271 nla_nest_end(skb, mp_attr);
2272
2273 lastuse = READ_ONCE(c->mfc_un.res.lastuse);
2274 lastuse = time_after_eq(jiffies, lastuse) ? jiffies - lastuse : 0;
2275
2276 mfcs.mfcs_packets = c->mfc_un.res.pkt;
2277 mfcs.mfcs_bytes = c->mfc_un.res.bytes;
2278 mfcs.mfcs_wrong_if = c->mfc_un.res.wrong_if;
2279 if (nla_put_64bit(skb, RTA_MFC_STATS, sizeof(mfcs), &mfcs, RTA_PAD) ||
2280 nla_put_u64_64bit(skb, RTA_EXPIRES, jiffies_to_clock_t(lastuse),
2281 RTA_PAD))
2282 return -EMSGSIZE;
2283
2284 rtm->rtm_type = RTN_MULTICAST;
2285 return 1;
2286 }
2287
2288 int ip6mr_get_route(struct net *net, struct sk_buff *skb, struct rtmsg *rtm,
2289 int nowait, u32 portid)
2290 {
2291 int err;
2292 struct mr6_table *mrt;
2293 struct mfc6_cache *cache;
2294 struct rt6_info *rt = (struct rt6_info *)skb_dst(skb);
2295
2296 mrt = ip6mr_get_table(net, RT6_TABLE_DFLT);
2297 if (!mrt)
2298 return -ENOENT;
2299
2300 read_lock(&mrt_lock);
2301 cache = ip6mr_cache_find(mrt, &rt->rt6i_src.addr, &rt->rt6i_dst.addr);
2302 if (!cache && skb->dev) {
2303 int vif = ip6mr_find_vif(mrt, skb->dev);
2304
2305 if (vif >= 0)
2306 cache = ip6mr_cache_find_any(mrt, &rt->rt6i_dst.addr,
2307 vif);
2308 }
2309
2310 if (!cache) {
2311 struct sk_buff *skb2;
2312 struct ipv6hdr *iph;
2313 struct net_device *dev;
2314 int vif;
2315
2316 if (nowait) {
2317 read_unlock(&mrt_lock);
2318 return -EAGAIN;
2319 }
2320
2321 dev = skb->dev;
2322 if (!dev || (vif = ip6mr_find_vif(mrt, dev)) < 0) {
2323 read_unlock(&mrt_lock);
2324 return -ENODEV;
2325 }
2326
2327 /* really correct? */
2328 skb2 = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC);
2329 if (!skb2) {
2330 read_unlock(&mrt_lock);
2331 return -ENOMEM;
2332 }
2333
2334 NETLINK_CB(skb2).portid = portid;
2335 skb_reset_transport_header(skb2);
2336
2337 skb_put(skb2, sizeof(struct ipv6hdr));
2338 skb_reset_network_header(skb2);
2339
2340 iph = ipv6_hdr(skb2);
2341 iph->version = 0;
2342 iph->priority = 0;
2343 iph->flow_lbl[0] = 0;
2344 iph->flow_lbl[1] = 0;
2345 iph->flow_lbl[2] = 0;
2346 iph->payload_len = 0;
2347 iph->nexthdr = IPPROTO_NONE;
2348 iph->hop_limit = 0;
2349 iph->saddr = rt->rt6i_src.addr;
2350 iph->daddr = rt->rt6i_dst.addr;
2351
2352 err = ip6mr_cache_unresolved(mrt, vif, skb2);
2353 read_unlock(&mrt_lock);
2354
2355 return err;
2356 }
2357
2358 if (!nowait && (rtm->rtm_flags&RTM_F_NOTIFY))
2359 cache->mfc_flags |= MFC_NOTIFY;
2360
2361 err = __ip6mr_fill_mroute(mrt, skb, cache, rtm);
2362 read_unlock(&mrt_lock);
2363 return err;
2364 }
2365
2366 static int ip6mr_fill_mroute(struct mr6_table *mrt, struct sk_buff *skb,
2367 u32 portid, u32 seq, struct mfc6_cache *c, int cmd,
2368 int flags)
2369 {
2370 struct nlmsghdr *nlh;
2371 struct rtmsg *rtm;
2372 int err;
2373
2374 nlh = nlmsg_put(skb, portid, seq, cmd, sizeof(*rtm), flags);
2375 if (!nlh)
2376 return -EMSGSIZE;
2377
2378 rtm = nlmsg_data(nlh);
2379 rtm->rtm_family = RTNL_FAMILY_IP6MR;
2380 rtm->rtm_dst_len = 128;
2381 rtm->rtm_src_len = 128;
2382 rtm->rtm_tos = 0;
2383 rtm->rtm_table = mrt->id;
2384 if (nla_put_u32(skb, RTA_TABLE, mrt->id))
2385 goto nla_put_failure;
2386 rtm->rtm_type = RTN_MULTICAST;
2387 rtm->rtm_scope = RT_SCOPE_UNIVERSE;
2388 if (c->mfc_flags & MFC_STATIC)
2389 rtm->rtm_protocol = RTPROT_STATIC;
2390 else
2391 rtm->rtm_protocol = RTPROT_MROUTED;
2392 rtm->rtm_flags = 0;
2393
2394 if (nla_put_in6_addr(skb, RTA_SRC, &c->mf6c_origin) ||
2395 nla_put_in6_addr(skb, RTA_DST, &c->mf6c_mcastgrp))
2396 goto nla_put_failure;
2397 err = __ip6mr_fill_mroute(mrt, skb, c, rtm);
2398 /* do not break the dump if cache is unresolved */
2399 if (err < 0 && err != -ENOENT)
2400 goto nla_put_failure;
2401
2402 nlmsg_end(skb, nlh);
2403 return 0;
2404
2405 nla_put_failure:
2406 nlmsg_cancel(skb, nlh);
2407 return -EMSGSIZE;
2408 }
2409
2410 static int mr6_msgsize(bool unresolved, int maxvif)
2411 {
2412 size_t len =
2413 NLMSG_ALIGN(sizeof(struct rtmsg))
2414 + nla_total_size(4) /* RTA_TABLE */
2415 + nla_total_size(sizeof(struct in6_addr)) /* RTA_SRC */
2416 + nla_total_size(sizeof(struct in6_addr)) /* RTA_DST */
2417 ;
2418
2419 if (!unresolved)
2420 len = len
2421 + nla_total_size(4) /* RTA_IIF */
2422 + nla_total_size(0) /* RTA_MULTIPATH */
2423 + maxvif * NLA_ALIGN(sizeof(struct rtnexthop))
2424 /* RTA_MFC_STATS */
2425 + nla_total_size_64bit(sizeof(struct rta_mfc_stats))
2426 ;
2427
2428 return len;
2429 }
2430
2431 static void mr6_netlink_event(struct mr6_table *mrt, struct mfc6_cache *mfc,
2432 int cmd)
2433 {
2434 struct net *net = read_pnet(&mrt->net);
2435 struct sk_buff *skb;
2436 int err = -ENOBUFS;
2437
2438 skb = nlmsg_new(mr6_msgsize(mfc->mf6c_parent >= MAXMIFS, mrt->maxvif),
2439 GFP_ATOMIC);
2440 if (!skb)
2441 goto errout;
2442
2443 err = ip6mr_fill_mroute(mrt, skb, 0, 0, mfc, cmd, 0);
2444 if (err < 0)
2445 goto errout;
2446
2447 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_MROUTE, NULL, GFP_ATOMIC);
2448 return;
2449
2450 errout:
2451 kfree_skb(skb);
2452 if (err < 0)
2453 rtnl_set_sk_err(net, RTNLGRP_IPV6_MROUTE, err);
2454 }
2455
2456 static int ip6mr_rtm_dumproute(struct sk_buff *skb, struct netlink_callback *cb)
2457 {
2458 struct net *net = sock_net(skb->sk);
2459 struct mr6_table *mrt;
2460 struct mfc6_cache *mfc;
2461 unsigned int t = 0, s_t;
2462 unsigned int h = 0, s_h;
2463 unsigned int e = 0, s_e;
2464
2465 s_t = cb->args[0];
2466 s_h = cb->args[1];
2467 s_e = cb->args[2];
2468
2469 read_lock(&mrt_lock);
2470 ip6mr_for_each_table(mrt, net) {
2471 if (t < s_t)
2472 goto next_table;
2473 if (t > s_t)
2474 s_h = 0;
2475 for (h = s_h; h < MFC6_LINES; h++) {
2476 list_for_each_entry(mfc, &mrt->mfc6_cache_array[h], list) {
2477 if (e < s_e)
2478 goto next_entry;
2479 if (ip6mr_fill_mroute(mrt, skb,
2480 NETLINK_CB(cb->skb).portid,
2481 cb->nlh->nlmsg_seq,
2482 mfc, RTM_NEWROUTE,
2483 NLM_F_MULTI) < 0)
2484 goto done;
2485 next_entry:
2486 e++;
2487 }
2488 e = s_e = 0;
2489 }
2490 spin_lock_bh(&mfc_unres_lock);
2491 list_for_each_entry(mfc, &mrt->mfc6_unres_queue, list) {
2492 if (e < s_e)
2493 goto next_entry2;
2494 if (ip6mr_fill_mroute(mrt, skb,
2495 NETLINK_CB(cb->skb).portid,
2496 cb->nlh->nlmsg_seq,
2497 mfc, RTM_NEWROUTE,
2498 NLM_F_MULTI) < 0) {
2499 spin_unlock_bh(&mfc_unres_lock);
2500 goto done;
2501 }
2502 next_entry2:
2503 e++;
2504 }
2505 spin_unlock_bh(&mfc_unres_lock);
2506 e = s_e = 0;
2507 s_h = 0;
2508 next_table:
2509 t++;
2510 }
2511 done:
2512 read_unlock(&mrt_lock);
2513
2514 cb->args[2] = e;
2515 cb->args[1] = h;
2516 cb->args[0] = t;
2517
2518 return skb->len;
2519 }
Linux with added FPC-III support